Microsoft is planning to ship its next major version of Windows - known internally as version '7' - within roughly three years, CNET News.com has learned. The company discussed Windows 7 on Thursday at a conference for its field sales force in Orlando, Fla., according to sources close to the company. While the company provided few details, Windows 7, the next client version of the operating system, will be among the steps taken by Microsoft to establish a more predictable release schedule, according to sources. The company plans a more 'iterative' process of information disclosure to business customers and partners, sources said.